That’s what Caltrans officials are urging motorists this weekend along a North County stretch of Interstate 15.

Starting at 7 p.m. on Saturday and lasting through 4 a.m. on Monday, three miles of southbound I-15 will be shut down due to freeway drainage work. The closure will extend from State Route 56 south to Rancho Penasquitos Boulevard/Poway Road.

All northbound lanes will remain open.

During the southbound closure, the three of the interstate's four express lanes will be open and free for all southbound drivers, officials said. Those express lanes will serve as the primary detour, though signs for a secondary detour route south along Black Mountain Road and east along Mercy Road will be posted.

There will be no northbound express lanes open along the three-mile stretch. Two express lanes are typically allotted for each direction.

Earlier this month, Gustavo Dallarda, Caltrans’ I-15 corridor director, said there was no way the agency could install the more than 300 feet of drainage improvements, which will be made in the middle of the southbound lanes, without closing the interstate. During heavy rains, enough water collects on a section of the southbound lanes to create a hazard.

And while no accidents have been reported as a result of the water collection, Dallarda said Caltrans was taking a “pro-active” approach to solving the problem.

He said the work on I-15 would cost between $200,000 and $250,000.

An even bigger traffic mess is expected in August when Caltrans shuts down all lanes on a South County freeway.

On Sunday, Aug. 18, Caltrans will close a 7-mile stretch of both directions of Interstate 805, from State Route 54 in Chula Vista to State Route 905 in Otay Mesa. It is scheduled to last from 3 p.m. on Aug. 18 through 5 a.m. on Monday, Aug. 19. To avoid that traffic mess, Caltrans encourages motorists to take the South Bay Expressway, which will be toll free for all motorists.

Because Caltrans calls those direct access ramps “DARs,” the agency has started calling the August closure on I-805: “Darmageddon.” It’s a take-off from a recent Los Angeles freeway closure dubbed “Carmageddon.”

At a press conference earlier this month, Caltrans officials said the freeway closures could result in three hours of gridlock for drivers stuck nearby. A Caltrans spokesman said on Wednesday that those estimates had been lowered to a worst-case scenario of about 1.5 hours of extra traffic near the I-805 closure and one hour of extra gridlock near the I-15 closure ---- still enough to throw a wrench in weekend plans.